There was no sign of an end to travel chaos as the wintry weather continued to take its toll on Britain.
As people battled with a cold snap that has brought snow and ice to large parts of the UK, Eurostar services were cancelled for a second day after its trains failed inside the Channel Tunnel.
People trying to travel by air also faced disruption as the freezing weather led to airport closures and flight delays, while conditions were also bad on many roads.
In Kent, which has seen icy conditions and heavy snow, three people died in a road crash after a collision between a car and a pick-up truck on the A20 at Wrotham in Kent.
The AA said it had attended around 7,000 breakdowns by lunchtime - almost as many as it would do for the whole of a normal Sunday. "We would still advise against unnecessary travel in the affected areas but if people do venture out, they should stick to the main roads, as lots of minor roads are still treacherous, if not impassable," a spokesman said.
Eurostar made emergency arrangements for 500 of its "most vulnerable" passengers who were stranded in London to cross the channel, the operator said. Customers such as the elderly and those with children were taken to Dover by train before continuing their journey to the Continent by ferry and coaches, according to a spokeswoman.
All affected passengers will be offered a full refund, £150 compensation and a free return ticket but Conservative MEP for the south east of England Nirja Deva described the offer as "paltry" and said it showed "how out of touch the management of this company really is".
Mr Brown visited St Pancras on Saturday as people arrived who had been trapped on four trains which broke down in the tunnel on Friday night. He said he was "very, very sorry" about the inconvenience.
The snow and ice also caused disruption to flights, with a number of airports including Inverness and Belfast closed for periods of the day. Flights in and out of Manchester were delayed for 90 minutes on Sunday morning because heavy snow continued to fall. But a spokesman later confirmed the runway was clear and flights were beginning to move.
Michael Dukes, forecast manager for MeteoGroup UK, the weather arm of the Press Association, said the cold snap was set to continue for the next few days.
